Who presumed Trayvon's innocence?

When reading a letter in today's Daily News (3/30/12) from Gary Schmitt of Glen Cove, L.I. which says, in part, "George Zimmerman may have been acting in self-defense, and that doesn't require Trayvon Martin to have had his own weapon. Until Zimmerman is charged and convicted he should be presumed innocent," I couldn't help wondering if Zimmerman (or anyone else) presumed Trayvon's innocence."